Kill an established Trumpet Vine?

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Trumpet vine is established in the middle of our flowerbed. It is under the lawncloth and mulch, intertwining with the other plans and spreading in all directions. For four years, I have partially dug every start, pulled up spreading roots and cut back, cut back, cut back. Unsuccessfully. Is there a way to kill a specific invasive plant without harming the surrounding plantings?



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